Quarterly report pursuant to Section 13 or 15(d)

Derivatives Derivatives - Valuation Adjustments (Details)

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Derivatives Derivatives - Valuation Adjustments (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Derivative [Line Items]          
Credit Valuation Gains (Losses) For Counterparty Credit Risk Related To Derivative Assets $ 304,000,000 [1] $ (963,000,000) [1] $ 454,000,000 [1] $ (1,454,000,000) [1]  
Credit Valuation Gains Losses Net Of Hedges Recognized In Trading Account Profits For Counterparty Credit Risk 100,000,000 [1] (312,000,000) [1] 275,000,000 [1] (1,051,000,000) [1]  
Credit Valuation Gain (Loss) Recognized In Trading Account Profit (Loss) Related to Changes in the Entity Credit Quality (288,000,000) [2] 759,000,000 [2] (893,000,000) [2] 692,000,000 [2]  
Derivative Credit Risk Valuation Adjustment, Derivative Assets 1,300,000,000   1,300,000,000   1,500,000,000
Derivative Credit Risk Valuation Adjustment, Derivative Liabilities 500,000,000   500,000,000   1,100,000,000
Credit Valuation Gains (Losses) Net of Hedges Recognized In Trading Account Profit (Loss) (252,000,000) [2] 765,000,000 [2] (1,020,000,000) [2] 648,000,000 [2]  
Counterparty Credit Risk Valuation Adjustment [Member]
         
Derivative [Line Items]          
Credit Valuation Gains (Losses) For Counterparty Credit Risk Related To Derivative Assets 51,000,000   51,000,000    
Debit Valuation Adjustment Member [Member]
         
Derivative [Line Items]          
Credit Valuation Gain (Loss) Recognized In Trading Account Profit (Loss) Related to Changes in the Entity Credit Quality 85,000,000   85,000,000    
Net Earnings Impact of Refinement [Member]
         
Derivative [Line Items]          
Credit Valuation Gains (Losses) For Counterparty Credit Risk Related To Derivative Assets     $ 34,000,000    
[1] At September 30, 2012 and December 31, 2011, the cumulative counterparty credit risk valuation adjustment reduced the derivative assets balance by $1.3 billion and $1.5 billion.
[2] At September 30, 2012 and December 31, 2011, Merrill Lynch's cumulative DVA reduced the derivative liabilities balance by $0.5 billion and $1.1 billion